my DECO S7 has had this problem for a while, it looks like in the first image, completely losing the Internet signal, and soon after (but not always) it goes to the second, I've tried to restart, change the dns and nothing solves, any ideas? this happens at completely random times of my day, and only the phone and the tablet lose connection, while the pc (which is also on Wi-Fi) always continues with a smooth connection and no drops

some things I've tried:
changing the DNS to google's, changing the operating mode from wifi router to access point